Wiktionary
cryocooler
n. A cryogenic cooler
Wikipedia
Cryocooler
A Cryocooler is a standalone cooler, usually of table-top size. It is used to cool some particular application to cryogenic temperatures. A recent review is given by Radebaugh. The present article deals with various types of cryocoolers and is partly based on a paper by De Waele.